<?php (defined('BASEPATH')) OR exit('No direct script access allowed');

// Originaly CodeIgniter i18n library by Jérôme Jaglale
// http://maestric.com/en/doc/php/codeigniter_i18n
// modification by Yeb Reitsma

/*
 in case you use it with the HMVC modular extension
uncomment this and remove the other lines
load the MX_Loader class */

//require APPPATH."third_party/MX/Lang.php";

//class MY_Lang extends MX_Lang {

class MY_Lang extends CI_Lang {


	/**************************************************
	 configuration
	***************************************************/

	// languages
	private $languages = array(
			'vi' => 'vietnamese',
			'en' => 'english'
	);

	// special URIs (not localized)
	private $special = array (
	);

	// where to redirect if no language in URI
	private $uri;
	private $default_uri;
	private $lang_code;
	
	/**************************************************/

	function MY_Lang()
	{
		parent::__construct();
		global $CFG;
		global $URI;
		global $RTR;
		$this->uri = $URI->uri_string();
		
		$this->default_uri = $RTR->default_controller;

		$uri_segment = $this->get_uri_lang($this->uri);
		$this->lang_code = $uri_segment['lang'] ;
		$url_ok = false;
		if ((!empty($this->lang_code)) && (array_key_exists($this->lang_code, $this->languages)))
		{
			$language = $this->languages[$this->lang_code];
			$CFG->set_item('language', $language);
			$url_ok = true;
		}
		
		if ((!$url_ok) && (!$this->is_special($uri_segment['parts'][0]))) // special URI -> no redirect
		{
			$langtoappend = $this->default_lang();
			
			// set default language
			$CFG->set_item('language', $this->languages[$langtoappend]);

			$uri = (!empty($this->uri)) ? $this->uri: $this->default_uri;
			$uri = ($uri[0] != '/') ? '/'.$uri : $uri;
			$new_url = $CFG->config['base_url'].$langtoappend.$uri;

			header("Location: " . $new_url, TRUE, 302);
			exit;
		}
	}

	function languageCode(){
		return $this->lang_code;
	}
	

	// get current language
	// ex: return 'en' if language in CI config is 'english'
	function lang()
	{
		global $CFG;
		$language = $CFG->item('language');
		$lang = array_search($language, $this->languages);
		if ($lang)
		{
			return $lang;
		}

		return NULL;    // this should not happen
	}


	function is_special($lang_code)
	{
		if ((!empty($lang_code)) && (in_array($lang_code, $this->special)))
			return TRUE;
		else
			return FALSE;
	}


	function switch_uri($lang)
	{
		if ((!empty($this->uri)) && (array_key_exists($lang, $this->languages)))
		{

			if ($uri_segment = $this->get_uri_lang($this->uri))
			{
				$uri_segment['parts'][0] = $lang;
				$uri = implode('/',$uri_segment['parts']);
			}
			else
			{
				$uri = $lang.'/'.$this->uri;
			}
		}
		return $uri;
	}

	//check if the language exists
	//when true returns an array with lang abbreviation + rest
	function get_uri_lang($uri = '')
	{
		
		if (!empty($uri))
		{
			$uri = ($uri[0] == '/') ? substr($uri, 1): $uri;

			$uri_expl = explode('/', $uri, 2);
			$uri_segment['lang'] = NULL;
			$uri_segment['parts'] = $uri_expl;

			if (array_key_exists($uri_expl[0], $this->languages))
			{
				$uri_segment['lang'] = $uri_expl[0];
			}
			return $uri_segment;
		}
		else
			return FALSE;
	}


	// default language: first element of $this->languages
	function default_lang()
	{
		return count($this->languages) > 0 ? current(array_keys($this->languages)) : 'vi';
	}


	// add language segment to $uri (if appropriate)
	function localized($uri)
	{
		if (!empty($uri))
		{
			$uri_segment = $this->get_uri_lang($uri);
			if (!$uri_segment['lang'])
			{
				
				if ((!$this->is_special($uri_segment['parts'][0])) && (!preg_match('/(.+)\.[a-zA-Z0-9]{2,4}$/', $uri)))
				{
					$uri = $this->lang() . '/' . $uri;
				}
			}
		}
		return $uri;
	}
}

// END MY_Lang Class

/* End of file MY_Lang.php */
/* Location: ./application/core/MY_Lang.php */